Shell for ultrasonic sensor and ultrasonic sensor

The utility model relates to the technical field of sensors, and provides a shell for an ultrasonic sensor and the ultrasonic sensor, the ultrasonic sensor comprises the shell, a polymer cap is mounted on a cap mounting portion of the shell, and a piezoelectric ceramic crystal is mounted on the cap mounting portion and located at the bottom of the polymer cap. Positive and negative wires are welded on the positive and negative electrodes of the piezoelectric ceramic crystal respectively, penetrate through the wire through holes respectively and extend to a third mounting groove in the bottom of the shell, a circuit board is mounted in the third mounting groove, and the positive and negative wires are connected with the positive and negative electrodes of the circuit board respectively; a first sealant layer is sealed in the third mounting groove and at the bottom of the circuit board; a sealing ring is further installed on the periphery of the shell. The utility model solves the problems that the oscillation